diff --git a/ufpy/algebra/sets.py b/ufpy/algebra/sets.py
index 53496ef..4722e23 100644
--- a/ufpy/algebra/sets.py
+++ b/ufpy/algebra/sets.py
@@ -47,7 +47,7 @@ def __update__(self):
     
     # Convert to other types
     def __repr__(self) -> str:
-        return f'u{self.set if self.set else '{}'}'
+        return f'u{self.set or '{}'}'
     
     def __str__(self) -> str:
         return repr(self.set) if self.set else '{}'